Azzurrante ottico

Si definisce azzurrante ottico o imbiancante ottico o sbiancante ottico o candeggiante ottico o correttore ottico o agente sbiancante fluorescente un composto chimico che addizionato ad un prodotto è in grado di migliorarne le caratteristiche cromatiche.

Principio di funzionamento

Gli agenti azzurranti sono generalmente costituiti da coloranti derivati dallo stilbene e dalla cumarina che, una volta colpiti dalla frazione ultravioletta della radiazione solare, sono in grado di riemettere in fluorescenza luce visibile di colore tra il viola-blu ed il blu-verde a seconda del colorante impiegato. L'effetto totale è un aumento della luce riflessa ed un conseguente aumento del grado di bianco congiuntamente ad una diminuzione del grado di giallo.

Azzurranti non ottici

Comunemente azzurranti (non ottici) si definiscono invece quei coloranti o pigmenti impiegati nella nuanzatura che a differenza degli ottici non aumentano il grado di bianco ma diminuiscono solamente il grado di giallo.

Voci correlate

Collegamenti esterni

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